79results about How to "Passive" patented technology

The invention discloses a passive heat removal system of a boiling-water reactor based on the characteristics of a nanometer fluid and belongs to the technical field of equipment and safety of nuclear power stations. The system consists of a valve controller, a water tank, a circulating pipeline, a valve and the like. In the case of unavailability of a station power supply, the quick removal of heat in the boiling-water reactor is realized by using the higher heat transfer characteristic and lower viscosity coefficients of the nanometer fluid and higher natural circulation capacity. The aims of preventing radioactive materials from being discharged and protecting the public and environments are fulfilled. When a severe accident occurs, a safety assurance function is executed and realized. The system is good in backup safety, simple in flow, stable in performance, high in reliability, convenient for implementation and simple to control.

The invention discloses a soil site dewatering and drainage method for protecting an archaeological site in humid environment. The method comprises the following steps that 1, 1.0m is outwards expanded at the explored peripheral side line of a region requiring archaeological excavation for forming an original state soil separation wall; 2, a sand filling water guide drainage ditch is dug around the separation wall, and a water guide passage easy to underground water flow seepage is formed; 3, the sand filling water guide drainage ditch is provided with a water extraction well; 4, water in the water collecting well is dredged in time. The soil site dewatering and drainage method aims at solving the problem of underground water discharge difficulty in the archaeological site in the cohesive soil region, and adopts a method of building the manual sand filling water guide drainage ditch on the periphery of the archaeological exploration part and building a water collecting well in the sand filling drainage ditch. In-site simulation experiments prove that the method has the advantages that underground water in cohesive soil can be discharged, and in addition, the capillary water movement can be blocked, so that the underground water level can be effectively controlled, the archaeological exploration part water seepage is prevented and controlled, and the smooth proceeding of the archaeological work is ensured. The method can also be used for protecting the archaeological site in humid environment shallow underground-water-bearing regions and preventing and controlling the water seepage in an exhibition hall. The goals of controlling the underground water around the archaeological site regions and preventing and controlling the seepage of the underground water into archaeological pits are achieved.

The invention discloses a major accident mitigation system of a nuclear power station on the basis of the nano fluid characteristic, belonging to the technical field of nuclear power station equipment and safety. The system is composed of a superconductive tube, a heat exchanger, a radioactive grain removing device, a nano fluid preparation chamber, an ultrasonic oscillator, an air cooling tower and the like. The system can quickly adsorb energy in a containment under the major accident, hyperpressure in the containment can be alleviated by releasing and removing radioactive air and radioactive aerosol particles, nano particles can be obtained, and the efficient heat exchange medium nano fluid can be prepared to achieve the goal of alleviating the major accident of the reactor and protecting the integrity of the containment structure. A safety control function is performed and finished when major accidents happen. The system has the advantages of good backup safety, simple flow, stable performance and high reliability, is convenient to implement and simple to control, and treats wastes with wastes.